P4/I2,Na,P2O5/Δ
P4/I2,Na,conc.H2SO4
P2O5,NaBH4
P2O5/Δ,P4/I2,Na
2(CH3)2CHCOOH + P4/I2,Na --------> HOOC-C(CH3)2-C(CH3)2-COOH + P2O5,Δ --------> given productOption B is correct.